krystle campbell lost her life. we're going to talk to a doctor who was on the scene, running in the race, and then turned right around to try to help those in need. i want to bring you up to date with the latest on the investigation. for that, to brooke. brooke? >> in terms of the investigation, u.s. officials are saying that there is no reporting, any connection with foreign connection, reaction from al qaeda thus far. here is what we do know. because different sources are telling cnn these bombs appear to have been placed in metal pressure cookers that were then hidden in backpacks. in terms of the saudi man we heard about, whose apartment has been searched, apparently sources telling cnn that that has no connection to the blast, but joe johns has been doing some digging and he reported that a timer and not a cell phone is what detonated those explosions yesterday around the finish line of the marathon and joe johns, let me talk to you, in terms of what you know what have you learned in the past hour or so? >> we